Telephone pay-station.



G. E. MUELLER. TELEPHONE PAY STATION.

, APPLICATION FILED FEB. 1. 1915.

Patented Mar. 7,1916.

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G. E. MUELLER.

TELEPHONE PAY STATION.

APPLICATION FILED FEB. I, I9l5.

11%,434. Patented Mar. 7,1916.

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G. E. MUELLER.

TELEPHONE PAY STATION.

APPLICATION FILED FEB. 1, 1915.

1,174,434. 7 Patent ed Mar. 7, 1916.

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G. E. MUELLER.

TELEPHONE PAY STATION.

APPLICATION FILED FEB. I. 1915.

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Patented Mar. 7,1916.

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TELEPHONE PAY STATION.

APPLICATION FILED 8.1.1915.

1,17%,434. Patented Mar. 7, 1916.

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TELEPHONE PAY STATION.

APPLICATION FILED FEB. I, 1915.

1,174,434. Patented Mar. 7,1916.

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TELEPHONE PAY STATION.

APPLICATION FILED FEB. 1. I915.

Patented Mar. 7, 1916.

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Fig/5 P UNITED STATES PATENT OFFICE.

GEORGE MUELLER, OF LA'GRANGE, ILLINOIS, ASSIGNOR TO KELLO GG SWITCHBOARD& SUPPLY COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

TELEPHONE PAY-STATION.

Specification of Letters Patent.

Original application filed December 7, 1907, Serial No. 405,602. Dividedand this application filed February l, 1915. Serial No. 5,408.

- ToaZZ whom it may concern: I

Be it known that I, GEORGE E. MUELLER, residing in La Grange, county ofCook, and State of Illinois, have invented new and useful Improvementsin Telephone Pay-Stations, of which the following is a specification.

The present application is a divisional application of my applicationfor telephone pay station systems, Serial No. 405,602, filed- December7, 1907, and in general relates to pay-station devices and systemswherein the deposit of a coin or token is required at the substationbefore. the connection can be completed through the central, oflice, thecoin being collected in case the desired connection is completed, andbeing returned to the subscriber in case the connection is notcompleted.

-Generally stated, an object of my invention is to provide a system,wherein a single magnet is employed to control the collection or returnof a coin, previously deposited, organized in a relatively simple mannerso that the cost of maintenance and inspection shall be slight, andwhich shall at the same time operate in a thoroughly reliable andsatisfactory manner.

In carrying out the invention, I have-so arranged the system that thereplacing of the receiver upon the hook-switch at the calling substationat the conclusion of conversation will operatively connect a polarizedmagnet, which controls the disposition of the coin, in circuit withthe-central ofiice battery, the said magnet collecting or re-..

storing the coin to the subscriber according to the direction of thecurrent flow through the substation at the time the receiver'isreplaced.

In organizing the system, I have arranged it in such a manner that theconnections of the central oflice battery, which is" prefer-' ablybridged across the calling'line, are 'reversed as soon as a calledsubscriber an swers, the reversing connections beingmaintained-thereafter independently of the act practice and systems, andit is in such con-' nection that I have elected to illustrate anddescribe'my invention, although in its general aspects, it is notrestricted to those Patented Mar. 7, 191

specific employments,'and I do'not wish to be limited in this respect.

Referring to the drawings, I have shown mechanism, diagrammaticallyillustrated,

which may be employed in connection with the circuits of Figs. 1 and 2.Fig. 6 is a top view showing. the off-normal switch combination of theselective switch, andFig. 7

is a sectional View on the line X X of Fig.

4, showing more particularly the. primary magnet and its associatedmechanism. In Fig. 8, I have shown a substation circuit comprising thecoin controlled mechanism of my invention' said circuit being connectedby a telephone line with aline circuit at the exchange,the-wholeoigaxiized to render it adaptable for party-line service. InFigs. 9, 10, 1 1, 12 and 13, I have illus trated telephone substationcircuit connections in connection with the coin collecting .mechanism ofmy invention.

Before proceeding to a description or the substation arrangements, Ishall first describe/the telephone systems in connection with which-theyare to be operated, the said systems constituting the environment inwhich the preferred form .of my" invention,

as herein illustrated, is shown.

Referring first to Fig. 1, the three parts thereof constitute asinglecircuit diagram,

in considering which, Part 1 is'-to be placed Part 2 between them. InFig. 1, Part 1,- I

have shown at the left a telephone line'in.

eluding the limbs P, S, connected with a V line circuit Cat theexchange. The circuits of the substation to which the limbs P, S

extend are not illustrated in 1, it being understood that any suitablearrangement 10b at the left'and Part 3 at: the right, with "i" may beprovided. It is suflicient for the present description to state that thesubstation mechanism may comprise the usual hook lever capable, onremoval of the receiver at the substation, of disconnecting the bellcircuit and connecting in the talking circuit, ltogether with a suitableimpulse transmitter adapted to transmit directive impulses over the linelimbs, the directive impulses being produced by successive openings oflimb P, while limb S is maintained grounded at the substation; and

. said lines, as called lines, are preferably divided according to theirdirectory numbers into groups of one hundred, the terminals of each onehundred appearing together before the Wipers of say, ten connectors (onthe usual ten per cent. basis). The said terminals of a line group arepreferably divided into ten sub-groups or sections, primary adjustmentsof the wipers' of a connector being produced to select a sub-group ofline terminals, Whereafter secondarymovements of the said wipers in anintersecting plane are produced to select the terminals of theindividual line Wanted.

Similarly, multiple calling terminals 19, 21,

23, are provided for each line which preferably appear along With theterminals of ninety-nine other lines in the contact banks before theWipers of a suitable number of line selectors E, of which ten would beprovided for one hundred lines on the --ordinary ten per cent. trunkingbases The one hundred sets ofterminals 19, 21-, 23 in the banks of aline selector, are preferably divided into ten sub-groups of ten contactsets each, primary movements of wipers 20, 22, 24, of a line selector Ebeing caused to select a subgroup of contacts including those of thecalling line, Whereafter, the secondarv movements of the said Wiper Willbe caused, in an intersecting plane, to select the terminals 0f theindividual. calling line. Each sub-group of contacts at'a line selectorE is provided with its individual group contact 25, there being one suchgroup contact for each sub-group of. terminals. The group wiper 26, byWiping over the group contacts 25, controls the primary movements of theline selector'E to select the group, whereafter the secondary travel ofthe switch in search of the individual contacts of the calling line iscontrolled by the individual private wiper 20 engaging the individualprivate multiple contacts 19.

The line selectors E are preferably not 7 constantly operating devices,but are normally at rest. A master-switch mechanism D is provided foreach group of subscribers lines as calling lines, said mechanism havingterminals 17*, 18 of each line select-or E which serves the line groupto Which the master-switch D belongs, whereby upon initiation of a callover any line of the group, the master-switch D will initiate travel ofan idle line selector E to select the calling line. Each line selector Ehas preferably a first selector F Which may comprise the adjustableWipers 70, 71, 72, having before them multiple terminals 73, 74, ofsecond selector G, which terminals Will be divided into ten groups often sets each, the terminals of each group being connected to secondselectors G assigned for connection to a different thousands of theexchange. The first selectors F have their Wipers adjusted responsive todirective impulses to select the group of multiple contacts formingterminals of the second selectors Gr assigned for connection to thethousand including the line of the called subscriber, Whereafterautomatic travel of wipers 70, 71, 72, will be caused to select theterminals of an idle second selector, all in the-Well known manner. Eachsecond selector G may comprise Wipers 87, 88, 89,

having before them one hundred sets of multiple contacts 90, 91, 92,forming terminals of connectors H. Said terminals are preferably dividedinto groups of ten sets before the Wipers of the second selectors, theterminals of each group being connected to connectors H assigned forconnections to a hundred lines of the thousand Which the second selectorG, before Whose wipers 'the terminals appear, serves. The secondselector G is first operated responsive to directive impulses to selectthe group of contacts 90,91, 92, forming terminals of connectorsassigned to the hundred among Which the called-for line is contained,Whereafter automatic travel of the selector G is produced to select theterminals of an idle connector.

The connectors H have before themv mul tiple terminals 10, 1-1, 12,- ofthe one hundred lines which they serve, the said terminals beingpreferably divided into ten groups before the wipers of the connectoraccording to the tens value of the directory numbers which the lineshave. The wipers 122, 124, 126, are first adjusted in a primarydirection responsive to primary impulses,

to select the group of ten terminals including those of the called line,whereafter secondary adjustments of the said Wipers are 139 be extendedto the calling subscriber, whereas if the said line be idle, a ringinggenerator will be connected thereto to ring the bell at the calledsub-station, and when the called subscriber answers the call by removinghis receiver, the conversation may proceed.

Assuming that the calling subscriber, whose line extends to substation Lin Fig. 1, Part 1, desires to connect his line for conversation to thatof subscriber M, whose number for the purposes of description may beassumed to be 2345, the subscriber at L, removing his receiver, causeslimbs P," S to be conductively united wherein current flows from batteryB through normal contact 9,"over limb S returning over limb 1?, normalcontact 7, line relay 1 to ound. Relay 1 energizes, armature 2 lockingthe said relay through contact 8, wire 16 and the relay 15 ofmaster-switch D to battery, it being understoodvthat the wire 16 isacommon 'wire having branches, one to each armature 8 of the cut-offrelays 5 of the lines that D serves. Armature 3 places ground upon thecontacts 10 at" the con-- nectors making them busy, whilearmature 4disconnects ground from the multiple contacts 19 of the line at the lineselectors.

rendering them selectable, and by engaging its alternate contact,operates group relay 13, whose attracted armature removes ground fromthe group contacts 25 0f thesaid group among which line L has its individual terminals, 19, 21, 23.

Since wipers 17, 18 of master-switch D normally engage contacts 17*, 18,of an, idle line selector E, the now attracted armature of relay 15closes a circuit from ground through contact 17,17, through primaryelf-normal (PO) contact '32 and relay 27 to battery, which relay, byarmature 29,- causes generator pulsations through magnet PM which stepswipers 20, 22, 24, 26, upon their primary travel, each step bringingwiper 26 to engage a successive group con-- tact 25 and the other wlpersopposite a difi ferent sub-grouper line terminals. fPrimary oil-normalcontact 32 (and also 31) being shifted on the first primary step, re-

' lay 27 depends upon locking armature 30 for its continued'energizations, the relay 27 continu'ng energized by current throughsaidattrac' d armature, the wiper 26 and to success' e grounds; through thecontacts 25 of sub-groups whose relays 13 are unoper'ated. In thepresent case, as soon as wiper 26 reaches the second contact 25,-

relay .27 will be deenergized and its armaturesfall back whereaftermagnet PM remains inert. A circuit isthen closed from ground throughnormal contact 29, shifted contact 31, normal contact 34, relay 28 tobattery, which relay energizes and, by its armature 41, closesa circuitfor generator impulses through'magnet SM which is now successivelyactuated, stepping wipers 20, 22, 24, on their secondary travel, insearch of contacts of the calling line, wiper 26 remaining motionlessengaging the selected contact 25. On the first secondary step of switchE, the secondary off-normal (SO) contacts 33, 34, 35, were shifted, 34opening the initial energizing circuit of relay 28,

the relay remalnmg dependent for contlnued energization upon attractedarmature 40 which has now connected the relay "E whereby wipers 20, 22,24, remain'engaging contacts 19, 21, 23, of the calling line L. Armature41 falling back," closes a circuit from ground'through normal contact37, normal contact 41, .shifted contact 35, through'contact 18, 18,relay R to battery, operating the relay R which closes a circuit.through magnet M which steps wipers 17,18, over the contacts 17, 18, aslong as relay R continues energized, which relay will continue energizeduntil wiper 18 engages a contact 18 of an idle line selector E, whichcontact will be ungrounded. When this occurs, relay R deenergizes andmaster-switch F stops. Before switch D can select the contact of an idleline selector, relay 15 will be deenergized, as hereafter explained, sothat the selected idle line selector will not be started;

As soon as relay 28 was first energized, relays PR. and SR weresimultaneously operated by. the closing of the alternate contacts at 39and 42, the contacts at the said points being make-before-break incharacter,

both on attractions and retractions of the ruption of theirenergizations. Armature 8 of relay 5 denergizes relays 15 and 1,whereupon armature 3 of the latter connects ground at normal .contact40, through attracted armature 6 to contacts 10 at the connector to holdthem busy. Subscriber L now operates his calling de vice to open thecircuit of limb P twice while holding the limb S grounded at thesubstation, whereby relay PR is denergized twice (relay SR remainingenergized), and two current impulses caused to flow from ground atselector F, attracted armature 47, retracted armature 45, normal contact61, magnet PM to battery B,,which magnet steps wipers 70, 71, 72, toselect the second group of second selector contacts 73, 74, 7 5, formingterminals of second selectors assigned for connection to the secondthousands of the exchange. Subscriber L now opens the circuit of limb Sonce while holding limb P grounded whereby relay SR is deenergized(relay PR remaining energized), whereon current .flows from groundthrough attracted armature 44, retracted armature 48, normal contact 62,primary offnormal (PO) contact 60, shifted (as was contact 59) on thefirst step of switch F, busy relay BR to battery, operating the saidrelay, which, by armature 68, causes generator impulses through magnetSM, stepping wipers 70, 71, 72, on their secondary travel which willcontinue as long as relay BR, now connected by armature 67 to wiper iscontinued energized by wiper 70 engaging successive grounded contacts73, contacts 73 of busy second selectors being characterized by a groundconnection. As soon as wiper 70 reaches a contact of an idle secondselector which will be ungrounded, no locking-circuit for relay BR willexist, the relay will be deenergized and armature 68 retracted,preventing further actuations of magnet SM whereby wipers 70, 71, 72,rest engaging the'contacts 73, 74, 7 5, of an idle second selector G ofthe second thousands. Retra'cted armature 67 places ground upon thewiper 70 and the multiple contacts 73 of the selected second selector.rendering it busy. The secondary-off-normal (SO) contacts 61, 62, wereshifted on' the first secondary step.

The subscriber L now opens the circuit of limb P three times and thecircuit of limb S once, as before, whereby relay PR is deenergized threetimes and thereafter relay SR once. The three denergizations of relay PRtransmit three impulses from ground, as before, the currentnow passingthrough normal contact 66, contact 71-74, magnet PM to. battery, whichmagnet is actuated three times to move wipers 87, 88, 89 opposite agroup of contact sets forming terminals of connectors assigned to thethird hundred of the second thousands. The deenergization of relay SRfollowing, transmits an impulse through normal contact 69, contact72-75, normal contact 79, shifted contact 77, (the PO contacts 76, 77,being shifted on the first step of the switch), relay BR to battery,which relay energizes and by contact 85, causes pulsations throughmagnet SM to efl'ect secondary travel of the switch; armature 84connects the relay, to wiper 87 whichengages successive contacts 90,establishing successive locking-circuits for relay BlFt until a contactof an idle connector H is engaged, the contacts 90 of busy contactsbeing grounded. This occur-' limb P four times and the circuit of limb S.once thereafter, as before, causing four deenergizations of relay PRand four current impulses to flow through contacts 71-74, 88-91, contactS0 magnet PM to battery B actuating said magnet four times which causesfour steps of wipers 122, 124, 126 to a position adjacent to the fourthsub-group of line terminals of its hundred including those numbered from2341 to 2349 inclusive, followed by those of 2340. On the first step ofthe switch H, the primary off-normal (P0 contacts 93, 94, 95, wereshifted. The following deenergization of relay SR transmits a currentimpulse through contacts 7 2- 75, 89-92, the shifted contact and magnetSM which magnet is energized a single time and steps wipers 122, 124,126, a step toward the selected group of contacts, it being understoodthat the positions of the wipers of a connector are normally two stepsdistant from the edge of their contact bank. By this first step, contactS0 was shifted to engage its alternate contact, and contact SO shiftedto disengage its normal contact, but not sufficiently to engage thealternate contact, two secondary steps of the connector being requiredto effect this.

.Subscriber L now causes five breaks of the circuit of the limb Pfollowed by one of limb S, as before, whereby relay PR is deenergizeolfive times and five impulses transmitted, as before, through contacts71-74,

88-91, alternate contact S0 contact 100,

magnet SM to battery, whereby five secondary steps of wipers 122, 124,126, are effected, the last of which will leave them engaging contacts10, 11, 12, of line 2345 that indicated at M. The followingdeenergization of relay SR transmits an impulse as before, throughcontacts 72-75, 89-92, alternate contact SO, contact 103, lower windingof test relay TR to battery B, which relay is energized to test thecalled-for line. By armature 112, relay TR energizes relay 99, circuitbeing traced from battery through.

SR, be deenergized since attracted armature 111 will have connected itsupper or locking winding with the same side of battery B? to whichcontact 10 is connected. The annatures of relay TR now retracting,current flows from ground through relay 106, attracted armature 101,normal contact 111, contact 12210, normal contact 3, relay 5 to battery,operating relay 5 which, by armature 6, connects the ground throughrelay 106 to the private multiple contacts 19 of the called line at theline selectors rendering said contacts busy. Armature 8 disconnects linerelay 1 from the called line. Armature 108 connects interrupter I withrelay 121 which is now energized and deenergized alternately connectingand disconnecting generator from the called-for line, giving thewell-known periodic ringing, generator current passing through contact12411, over limb P through the called-for substation, re-

turning over limb S, contact 12-126, at-

tracted armature 109, to ground through battery B As soon as the calledsubscriber answers and the armature of relay 121 is retracted, circuitis closed from ground through release relay RR attracted armature 107,normal contact at relay 121, out over limb P and through the conductivebridge at the substation produced by the elevated hook lever, returningover limb S, attracted armature 109 to battery B Armature 104 nowoperates relay 113 which, by armature 116, looks to groundat contact 97.Armature 115 disconnects relay 121 from interrupter I so that the relayremains thereafter inert, while armatures Y114 and 119 close contacts inthe talking conductors of the connector, the talking circuit throughoutFig. 1 and the other circuit diagrams being indicated heavily markedconductors. -As

soon as relay 118 is energized, a branch of the before traced currentextending from;

ground through jrelay RR out over limb P, returning over limb S, isestablished through attracted armature 119, thence to the left over'thelower'talking conductor,

through attracted armature 48 and relay 56 to battery B, energizing therelay 56 whose attracted armature energizes the reversing relay 51,which latter, by armature 52, looks itself to ground at shiftedcontact-59. Relay 51, by its attracted armatures 53 and 54, now reversesthe connections-of batteries A and B to the upper and lower conductorsof the talking circuit of first selector F, current now flowing from.the positive or active pole of battery A through relay PR, alternatecontact 54, over the lower talking conductor, over limb 'S, returningover limb P, through alternate contact 53, and through relay SR to thenegative side of battery B said batteries A and B being grounded attheir intermediate points. Thus, the direction of current flow in thecalling line is automatically reversed when the calling subscriberanswers the call, and it is this reversal which I employ in connectionwith my coin collecting structures. 7

The calling and called subscribers are now in conversation over acircuit which may be traced by the heavily markedconductors fromsubstation L to substation M, the transmitter at L being suppliedby'current over the circuit just traced, While the transmitter at M issuppliedby current from ground through relay RR flowing out over limb P,returning over limb S and to battery through impedance 120, at H, andthe Winding of relay 56 at F. .When the subscribers have finishedconversation they replace their receivers. Assuming that subscriber Ldoes so first, switches E, F and G are released and when subscriber Mthereafter replaceshis receiver, switch H will be released. This isaccomplished as follows: The replacing of the receiver at substation Ldeenergizes relays PR and SR simultaneously-for the first time sincethey were first operated. Current thereupon ,flows from ground throughrelay RR, at F, through retracted armatures 46, 43, the contact 33 at E,lower winding of relay RR to battery B. Relay RR is then energized andit closes a circuit from ground through armature 29, contact 31,armature 36, release magnet RM to'battery, which magnet is energized andwithdraws the retaining pawls of line selector E whose springs are thenrestored to normal, at which time the primary off-normal (PO) andsecondary off-normal (SO) contacts will also be shifted to normal.During restoration, relay 28 will be held operated by current throughattracted armature 37 of relay RR whereby the talking wipers 22, 24,

will be on open circuits. The energization,

of relay RR by armature 63, locked itself in series with relay BR, whichis thereby energized, and, by armature 65, connected battery B, throughcontact 70-73, contact '76, relay RIP, to ground whereby RR wasenergized and locked itself in series with relay BB 4 As soon as relaysRR and BR were simultaneously energized, circuit was closed from groundthrough armature 68, alternate contact 64, release magnet RM to batteryB",

whereby magnet RM has energized to restore the first selector F tonormal, the primary off-normal and secondary off-normal contacts beingalso restored. When relays BB andBR were energized as described, currentflowed from ground through alternate contact 85, alternate contact 81,release magnet RM to battery, operating the said release magnet RM onwhose energi-.

-normal contacts, when all apparatuswill be in its original idlecondition. If subscriber M had first replaced his receiver, switches F,G and H would have been restored, the line selector E remaining to berestored by the calling subscriber L when he replaced his IQCClVGL.

The prior replacing of the receiver at substation M opens the linecircuit causing deenergizations of relay RR and also of the relay 56 atF which was held energized in series with relay RR", whereon retractedarmature 58'would close circuit from battery B through attractedarmature 55, release relay RR to ground whereafter the release of firstselector F and second selector G would proceed as described. The releaseof connector H would occur as before described. It willbe observed thatalthough F is restored, the reversed connections of batteries A and B tothe calling line are still maintained, since relay 51 is held locked by.current through armature 52, spring 35 atE and contacts 41, 37 toground. "When subscriber L now replaces 7 his receiver, relay RR atfirst selector F will be operated in the series of relay RR, as beforedescribed, and line selector E will be restored, as before described.

If at the time the test relay TR was energized while wipers 122,124, 126of connector H were engaging contacts 10, 11, 12, of the called line,the said called line had been busy, its contacts 10 would have been-grounded in one of the manners hereinbefore described. In such case,relay TR would have been locked when its armature 111 was attracted bycurrent 'flowing from battery B through its upper winding,said attractedarmature, wiper 122,, and to ground through the engaged contact 10. Thusarmature 110 would be held attracted and the busy signal would betransmitted from the interrupter I, through said atsaid magnet of therelay BB closes a circuit from battery B, through alternate contact 82,the

back contact of armature RM before the is energized, the contact 2790,contact P0 normal contact 117, relay 96 to ground, said relay 96 beingenergized and in turn energizing magnet EMF 'which restores theconnector to normal.

Referring now to Fig. 2, this figure is to be superposed upon Fig. 1 sothat its wipers 70, 71, 72 are adjacent to the multiple contacts 73, 74,7 5, of second selectors G, while the left edge of said Fig. 2 is to beplaced on the dotted line'Y Y of Fig. 1 when it will be understood thatthe conductors of Fig. 2 are to join the corresponding conductors ofFig. 1. At E in Fig. 2 areshown the circuits of the line selector towhich the wipers 20, 22, 24, 26, of Fig. 1 are now to be considered apart and to which the contacts 17 and18 of Fig. 1 are now supposed to beconnected. The said line selector E is the same as that shown at E inFig. 1, and description thereof is unnecessary. The first selector F hassubstantially the same circuit arrangements as the first selector F ofFig. 1, and any particular description thereof is unnecessary, it beingsuflicient to point out the differences as between the two circuits. InFig. 2, the calling lamp signal 128 and the ringing lamp signal 129 areassumed .to be located at the operators position at which is also theoperators set indicated as a whole at V and also the operators callingdevice 133, controlling springs 131 and 132 connected in the upper andlower talking conductors of the first selector. All of this apparatus,of course, is in addition to that included in the first selector of Fig.1.

For controlling the signal lamp 128, a front contact 7 relay PR, whilethe grounded connection of armature 47 of relay SR is carried through anormal contact 5* of relay 51. An addi tional primary off-normal (PO)contact 130 is provided to extinguish the lamp 128 on the first step ofthe first selector, while another contact 131 is provided to close acontact in the circuit of ringing lamp 129 on included in the circuit oflamp 129 so that is added for armature 45 ofthelamp may be extinguishedwhen the called subscriber answers the call.

In employing the system including 'Fig. 2

and the indicated portions of Fig. 1, substation equipments such as areused in manual' telephone practice are employed, calling devices such as133 being employed only at attracted armatures 47, 45, contact 130 andlamp 128 to battery. The operator observing the signal will press levers127, 127, of

'her listening key to include her talking set in circuit with thecalling line and will inquire the number of the line wanted. Havingascertained this, she will throw the said levers 127, 127 to engagetheir associated grounded contacts, whereby the calling line will beshort-circuited, although relays PR and SR will be maintained energizedas before. The operator will then actuate by hand the calling device 133in the direction of the arrow, thereafter releasing it when itsassociated spring will turn it back to normal.

As many breaks will be caused by its return at spring 131 in the circuitof relay PR as teeth have been moved to the right of said spring, andafter. the last of these breaks and the renergization of relay PR, thelowermost tooth of dial 133' will cause a single break in the circuit ofrelay.SR' causing its momentary denergizati'on. It is thus apparent thatthe operator may, with the aid of the calling device 133, producesuccessive sets of denergizations of relays PR and SR to count out thenumber of the called subscriber, just as did the calling subscriber inthe description of Fig. 1, the impulses transmitted by thedenergizationof the said relays, operating precisely as 'described inconnection with Fig. 1, first to operate the first selector F andthereafter the second selector G and the connector-H to connect with thecalled for line. the operator completes-the transmission of theimpulses, she restoreslevers 127, .127,-

and the circuitfor relays PR and SR as reestablished withoutinterruptions of the energizations' of said relays over the callingsubscribers line. The testing of the called line and restoration tonormal of the various switch parts are produced just as described inconnection withrFig. 1.

It will be observed that 1n the present case, at the conclusion ofconversatlon,

When 9 should the called subscriber first replace his receiver,the'first selector F would be restored to normal so that switch 130would be shifted back to again engage its contact. This .will not,however, cause the calling lamp 128 to again glow since the relay 51, byits armature 52, will have locked itself to ground through contact 35 atthe line selector E and by its armature 5*, have opened the contact inthe circuit of line lamp 128.

In the semi-automatic system just described, the reversal of thedirection of current flow in the calling line is produced in the samemanner as that described in connection with a purely automatic system.It will be observed in both of thesecases that the continuation of thereversed flow after it is once produced, is dependent upon the relay 51whose locking circuit is in no way controlled by the called subscriberor by the release of the first selector F or F", which the calledsubscriber can restore, for when energization' of the relay 51 has oncebeen produced it will continue until the calling subscriber replaces hisreceiver thereby restoring the line selector E or E and opening contact35.

In Fig. 8, I show at Wthe circuits of a preferred substation arrangementadapted for use in connection with party-line service. The saidsubstation is connected by limbs P, S of his telephone line with thespewhich may be bridged across the limbs P, S

in the same manner as the substation W.

, This arrangement is provided in order that when a subscriber desirestoinitiate a call, he may remove his reoelver andthus establish aconductive bridge of limbs P and S v without operating the line why 1this being eflected only when limb P of the line is grounded at thesubstation by the'placing of a coin in the coin slot 209 after thereceiver has been removed and the hook lever elevated.- As will be seen,the interrupter 1 1s normally connected operativelybymeans of aninduction coil and condenser with limb' S via normal contact 2*, to theend that a calling subscriber-may, before depositing his a coin, removehis receiver and listen upon the line; if the line be idle, he w1llrecelve a signal from, the interrupter 1 WlllCll preferably operates togive a signal in a manner 1 distinct from the usual busy back machine,

which will advise him that the line is idle,

connection with a call from one of the other stations W, W or Wconnected to the line, the line relay 1 of cut-ofi relay 5 W111 beenergized, and the interrupter 1 disconnected from the limb S, in whichcase the calling subscriber in hearing the signal, will know the line isbusy and will replace his receiver.

At substation WV, limb P normally extends through normal contact 215,through the call -bell and the lower switch contact of hook lever 200,the condenser 300 and through contact 214 to limb S; this circuit beinginductive only, on account of the condenser 300 and forming a pathtransparent to rapidly alternating signaling current but opaque todirect current. The limb P also extends .over a branch through thetransmitter to alternate contact 204 of hook-lever 200, while limb Sextends through normal contact 214, magnet 213 to alternate contact 203,so that when the receiver is removed and hook-lever 200 is raised, thetwo limbs P, S will be conductively united through a double contact203200204. Spring 214, in addition to its connection with the condenser300, has a connection extending to spring 206 of the Dav-station device209, whose other spring 207 is connected through the armature contact ofrelay 213 with the hook switch contact 201. The associated contact ofspring 207 isin circuit relation with limb P through normal contact 215.The armature 301 of "the polarized magnet 205 extends within the coinslot 209 and normally is in theintermediate position shown, the positionbeing such as to serve as a. support for the deposited coin, which whendeposited, will descend by gravity and come to rest at the extremity ofarmature 301, and will press springs 206, 207 outward to engage theircontacts. The calling device 210 is diagrammatically illustrated as adisk provided with teeth of insulating material, said disk being adaptedto be rotated by hand in the direction of the arrow, a spring beingprovided to return it in the opposite direction, when released, foractuation of springs 211, 212.

It being assumed that the subscriber at substation W desires to initiatea call, he will first remove the receiver from hook lever 200, whichwill thereupon rise to close contact 203200 204, whereafter the subscriber will listen and the line being assumed to be idle, will receivea signal advising hiin of this from interrupter I over a circuit'extending'through normal contacts 2 and 9,

' over limb S, contact 214, condenser 300, the

telephone receiver, contact 200'-204, the

transmitter, contact 215, returning over, limb P, normal contact 7,upper winding of relay 1 to battery. The subscriber will thereupondeposit a coin in slot 209 which will close contacts 206, 207, as beforedescribed. A circuit will thereupon be closed as follows: from groundthrough contact 201 (contacts ance 208, closed contact 207, contact 215,

over limb P, contact 7, upper winding of relay 1 to battery A, theenergized relay 1 thereon locking itself by current through its lockingwinding and master-switch relay 15 to battery B. As soon as relay 1* isenergized, armature 2 disconnects interrupter I so that any othersubscriber listening in will know that the line is busy. The contactwipers 20, 22, 24, 26, maybe considered the Wipers of the line selectorE of Fig. 1, Fig. 8 being superposed on Fig. 1 with its right edge upondotted line Y Y, and the said line selector will now be automaticallyoperated, as before described, to seek out the terminal contacts of thecalling line. As soon as this has occurred, the batteries A and B willbe bridged across the calling line and current will flow from battery Athrough primary relay PR, normal contact 53, to the left over the uppertalking conductor, through contact 22, 21, alternate contact 7, linelimb P, contact 215, through the transmitter contact 204-200203, throughrelay 213, energizing it, through contact 214, over limb S, contact2324, to the right over the lower talking conductor, normal contact at54, relaV SR to battery B Thus relay 213 is energized to attract itsright-hand armature to open the before traced connection from ground atspring 201 extending to limb P, and its left hand armature, to withdrawthe locking pawl from the dial 210, the said dial having been lockedwhile relay 213 was deenergized, and so continuing until the callingline was selected by the line selector. The calling subscriber W willnow operate dial 210 to count out the number of the .called forsubscriber, and assuming this number to be 2345 he will first rotate thedial until two teeth are brought below spring 212 andthereafter releaseit. In its return, the second tooth brought below the spring "212 willactuate the said spring to engage contact 215 and thereafter to causethe said contact 215 to disengage its normal spring. Thus, a maintainingcircuit for SR will be completed over limb S through spring 214,

.relay 213, contact 203200204, contact -215212 to ground before therelay PR is held energized. Afterv the last of these, the

I for relay PR will first be establis ed, ex-

tending through contact 215, the transmitter and hook-lever 200, throughrelay 213, contact 214 -211, to ground, whereafter the opening ofcontact 215 will deenergize relay SR, while relay PR remains energized.As the said tooth passes below spring 211, the spring is restored andthe two relays held operated over the metallic circuit of the line. Itis thus apparent that by successive operations of dial 210, thesubscriber may count out the called subscribers number, deenergizationsof PR being produced in number corresponding to the number of teethpassed below spring 212 on each operation of the dial 210, each saiddeenergization being followed by a single deenergization of rela SR.

lit will be noted that while the receiver is off the hook and-the coindeposited in slot 209, the polarized magnet 205 still has its circuitopen at contact 202 which was shifted along with 201, when the receiverwas removed. Let it first be assumed that the line of the called-forsubscriber was found busy by the'connector, in'which case the callingsubscriber, of course, receives a busy signal in his receiver. In suchcase, there will have been no reversal of the connections of batteries Aand B to' the calling line, that of W. When now the subscriber at Wreplaces his receiver, contact 202 will be closed before lever 200disengages contacts 203 204 which are following contacts. Thus, onreplacing the receiver, the shifting of the hook-lever does not open atonce the circuit of line limbs P, S, connection being traceable over thelimb S through contact 214, the closed contact 206,

through magnet 205, contact 202, contact 215 to limb P and current willflow through its circuit from the bridged batteries A and B through saidmagnet 205 in a direction to tilt its armature to the right, whicharmature will. then be remdve'd fromsupporting relation from thedeposited coin which will descend through the left-hand branch of slot-209 and be returned to the subscriber. If, however, the calledsubscriber has answered the call, the connecticnsof batteries A and B tothe calling line would have been automatically reversed by the responseand when the calling, subscriber replaced his receiver at the conclusionof conversation, the current through magnet 205 would 'be of oppositepolarity from that flowing therethrough when the called-for line wasfound busy. On account of the opposite polarity, the armature -toreceive one.

of magnet 205 would of course be tilted to the left, allowing the cointo then descend by the right branch of slot 209 into the till,

'being thus collected. It is thus seen that the calling subscriber,provided with the pay-station device of my invention, by the replacingof his receiver, practically tests the battery connections which existto his line at that time, and that the single polarized magnet 205operates in response to the testing to either collect or return the coinaccording as the calling subscriber has received a response to his callor has failed This system of operation whereby the calling subscribertests a current flow in his own line at the conclusion of conversationfor the purposes of determining whether or not a charge shall be madeagainst the line, is believed to be novel and will be broadly claimed.

The structure'of Fig. ,11 is largely similar to that of Fig. 8 as to itssubstation features, the distinguishing characteristics of Fig. 11 beingthat the right-hand armature of relay 213 is dispensed with. To securethe-opening ofthe connection at spring 201, before the dial 210 beginsits operative openings of contact 215, I provide a ratchet bar 222pivoted at about its middle point and linked insulatingly by arm 221 tohooklever 200, the bar 22l having'a lost motion coupling with thehook-lever. Thus, when the receiver is removed from the hook-lever 200,the switch contacts controlled thereby are closed as in the case ofFig..8,-and when the coin is deposited in the slot 209 (after thesubscriber has listened and found the party-line idle) current will flowfrom ground through spring 201, contact 222, contact 207, andcontact'215 over line P to energize the line relay 1, it beingunderstood that the substation Fig. 11 is to be operated in connectionwith the line circuit at C. As soon as the line is selected, the magnet213 will be energized to unlock the calling device 210. As soon as thesubscriber rotates the dial in the direction of the arrow to transmitthe first impulses, the arm 223 fastened to the dial will free the endof pawl 222, which will then be tilted about its pivot by the associatedspring to open the contact 223, the lost motion connecting at 200permitting of this.

When the calling subscriber replaces his receiver, the coin will becollected or restored as in Flg. 8 and arm 221 will restore .the-

210 will assume its normal position.

The structure illustrated in Fig. 9 is for pawl 222 to close itscontact, whereon arm connections required therefor. No detaileddescription of Fig. 9 is therefore necessary,

theparts in Fig. 9 corresponding to those of station arrangements shownin Figs. 8, 9.

and 11, the well known arrangement of talking connections is employedinvolving parallel paths through the substation. The circuit of linelimb P, after passing through the transmitter, has two connectionsextending to limb S, one connection being opaque to voice currents andtransparent to direct currents by the inclusion of the impedance of therelay 213 in said bridge, while the other bridge is opaque to directcurrent and transparent to'voice currents by the inclusion of thecondenser 300, this latter path also including the telephone receiver.It is thus seen that I employ the winding of the impedance coil in usein connection with the talking circuit as a relay or magnet to controlthe unlocking of the dial and also by an armature switch to control thecircuit connection of theline limb P to the ground at spring 201. I

In the structure of Fig. 13, the calling subscriber must first removehis receiver and listen to ascertain the idle or busy condition of theline, the said structure being for use in connection with party linesThe receiver is then to be replaced and a coin dropped in thepay-station, closing contacts 206, 207. The receiver, being againremoved, the using of the hook lever, by the stud at the end of arm 231passes down on the left side of the slantingly mounted actuating memberof spring 230, causing said spring to momentarily engage its associatedcontact, whereby the initial energizing circuit for relay 1 (Fig. 8) isclosed and the selection by the line selector proceeds as before, thecalling device being thereon duly unlocked by magnet 213. When lever 200is fully elevated, the stud on 231 is below the actuating member, sothat on replacing of the receiver it will pass upon the right sidethereof to normal without causing a second grounding of limb P. Thecircuit of magnet 205 is completed when the receiver is replaced as inthe preceding figures.

The structure shown in Fig. 10 may be employed in connection with thesystem of Fig. 1. The removal of the receiver in Fig. 10 will obviouslyoperate line relay 1 of Fig. 1, causing the line selector to select. InFig. 10, the deposit of a coin is thus unnecessary at the'start.However, the calling subscriber c'a'nnot complete the call withoutdepositing a coin because the contact at 215 is short-circuited by thewires leading to contact 220, so that no opening of limb P can beproduced to control relay PR until a coin is deposited. Moreover themagnet.

213 is normally short-circuited at normal contact 206 so that, until acoin has been deposited, magnet 213 cannot be actuated to unlock thedial. But one of the short circuits described are necessary in a singlestructure, but I have shown two to illustrate the general applicabilityof a normal short cliorcuit rendering a signal circuit inopera is.

In Fig. 12 is shown a structure employing an induction coil commonbattery talking circuit. Here an arm 225 unlocks dial 210 onremoval ofthe receiver. Arm 200 normally holds pivoted coin support 209 in thecoin freeingposition. On removal of the receiver arm 200 frees thesupport which moves to the supporting position; Ubviously, device 210 isinoperative till a coin is deposited, contacts 228, 215 beingshort-circuited at 206 and 220, the subscriber being thus obligated todeposit his coin. The current flowing in the line until the called forsubscriber answers, is in a direction to tend to throw the armature ofmagnet 205 downward, this obviously having no efiect upon support 209.As soon, however, as the called-for subscriber answers, the reversedcurrent throws the armature of magnet 205 upward which actuates support209 -to collect the deposited coin.

The mechanical switch, Figs. 3 to .7, will now be briefly referred to,it being understood that any suitable mechanism may be employed. Thediagrammatically illustrated' switch of Figs. 3 to 7 is'morespecifically the line selectorF or E. As indicated in Figs. 3 and 4, inwhich latter figure each line contact set 19, 21, 23,- is indicted by asingle short line, the line contacts are arranged in ten vertical rows,each row being a group, the said contact sets progectlng as from theinner surface of a section of a sphere. The group contacts 25 arelocated immediately below their respective groups. The wipers 20, 22,24c, and group wiper 26 are connected with the rotary primary shaft PS,wiper 26 being rigidly connected, wh1le wipers 20, 22, 24: are pivotallyconnected at 350.

2 Primary movements of the wipers are effected by rotating shaft PS'step-by-step from left to right, a ratchet 355, Fig. 7, being fastenedtosaid shaft and adapted to be driven by armatureactuatedpawl 356 ofmagnet PM, the retaining pawl 357 being provided to prevent returnmovement under the influence of spring 352 against whose tension shaftPS is rotated. Each actuation of pawl 356 steps ratchet 355 and shaft PSto move wipers 20, 22, 24, opposite the next contact group, wiper 26being correspondingly moved to engage the next group contact 25.Secondary movements of wipers 20, 22, 2t, "(wiper 26 then remainingmotionless) are effected after the primary ad- SM whose armatureactuated pawl 359" engages the teeth of its associated ratchet out inshaft SS. Said shaft has fastened to it a broad piece 351 which engagesan antifriction bearing in the rearwardly extending support of wipers20, 22, 24, said piece being broad so that however the wipers may beprimarily adjusted, the bearing Will-still engage said piece 351.Successive actuations of magnet SM, by pawl 359, step shaft SS downward,retaining pawl 360 holding the shaft against back movement under theinfluence of spring 353, whose tension is exerted against the downwardmovement of SS being linked thereto by the pivoted lever 354 looselyengaging a screw on shaft SS. Each downward step of shaft SS by piece351 steps the contact ends of;wipers 20, 22, 24, a step upward to engagea next set of contacts 19, 21, 23. To release the switch, release magnetPM is energized. Its attracted armature 358 turns retaining pawl 357about its pivot to disengage ratchet 355, which pawl being ininterlocking relation with retaining pawl 360 withdraws the latter todisengage the retaining ratchet by shaft SS. The secondary shaft SS isnow restored by spring 353, the wipers 20, 22, 24, being brought down tofree the contact bank. To prevent tension of spring 352 from beingeffective while shaft SS is restoring, detent 37 0 is provided uponpiece 361, which piece, when shaft SS is at normal, ispressed upward bypiece 371. The first downwardv step of shaft SS permits piece .361 tofall down when detent 370 will engage any adjacent tooth of ratchet355.to hold the ratchet and shaft PS, inadjusted position until theshaft SS reaches normal, when piece 371 lifts piece 361, bringing detent370 to normal when spring 352 is free to restore the primary shaft andwipers. It is obvious that movement of iece 361 on the first step ofshaft SS permits the secondary. off-normal SO, springs to shift by theirtension to their alternate positions, while the restoration of shaft SS,restoring piece 361, also restores the secondary off-normal springs.Piece 364: fastened to primary shaft PS, Fig. 6, has a stud 363 normallyengaging the controlling spring of the primary offnormal, PO, contacts.With the first step of shaft PS, stud 363 frees said spring and theoff-normal contacts shift under their tension. On restoration of shaftPS, stud 363 engages the controlling springs shifting the contacts backto'normal. For first selector F, second selector G and connector H, themechanical arrangement of Figs. 3'to 7 may be employed, the arrangementof primary and secondary off-normal contacts indicated in Fig. 1 beingof course provided. The group wiper 26 and contacts 25 are, of course,unnecessary for these employments.

As before indicated, for the connector H, two secondary steps,of theWipers are required to bring the Wipers to engage the first contact setof a selected group.

' Obviously my invention is not to be limited to the precise arrangementherein shown and described, as my invention, as already indicated, isnot only capable of employment in various environments but is readilysusceptible to modification to meet diflerent environments as has beenherein exemplified. In the structures which I have illustrated, I havechosen to cause the unlocking of the automatic substation dial to beeffected by electrical circiut changes produced in consequences of theclosure of a contact by the deposit of a coin. But it is, of course,within the scope of the invention that this unlocking be producedmechanically by the coin. Other modifications of the structures willreadily suggest themselves to those skilled in the art, and I therefore,do not Wish to be limited in this respect.

While I have shown a plurality of battery symbols in the circuitdiagrams, it will be understood that such symbols as have their likepoles grounded may be, and preferably are, a single source of current.Similarly, the multiplicity of generator symbols do not necessarilyindicate separate sources of current. I

Having described my invention, what I claim as new and desire to secureby United States Letters vPatent, is'

1. A telephone system including a calling telephone line, a pay-stationdevice at the substation of said telephone line, a disposing magnettherefor, automatic switching apparatus at the exchange connected tosaid line, an operators calling device at the exchange for extendingsaid automatic apparatus to a called telephone line, 'a source ofcurrent, and circuit connections including said mag net and said sourceof current effective when tending said automatic apparatus to a calledtelephone line, a source of current, and ciw cult connectlons includingsaid magnet and said source of current effective when the callingreceiver is replaced to operate said magnet to collect or return adeposited coin according as a response has or has not been secured fromthe called line.

3. A telephone system including a calling I telephone line, a paystationdevice at the I substation of said telephone line, a polarized disposingmagnet therefor, vmechanism adapted to respond to said magnet forcollecting or'returning a deposited coin, automatic switching apparatusat the exchange connected to said telephone line, an operators callingdevice at the exchange for extending said automatic apparatus to acalled telephone line, a source of current,- circuit connectionsincluding said'magnet and said source of current effective when thecalling receiver is replaced to operate said magnet to collect or returna deposited coin according as a response has or has not been securedfrom the called line, and means for thereafter interrupting said circuitconnections to effect a restoration of the automatic switchingapparatus.

4. A telephone system including a calling telephone line, a pay stationdevice at the substation thereof, a magnet therefor controlling thedisposition of a deposited coin, a called subscribers line, an automaticswitch for extending connection' in the direction of the saidcalled'line, an operators calling device at the exchange for controllingthe said automatic switch, a battery associatedwith said automaticswitch having its opposite poles connected to the limbs of the callingline, and means controlled by the response of the called subscriber forreversing said connections whereby the saidmag'net operates to collect adeposited coin.

subscribers line, a substation therefor provided with a coin suspensiondevice, a called subscribers 'line an automatic switch for extending-aconnection in the direction of the said called subscribers line, anoperators calling device located at the exchange for controlling saidautomatic switch, a battery associated with said automatic switch havingits opposite poles connected to the limbs of thecalling line, meanscontrolled. by the response of the called subscriber for reversing saidconnections, and means controlled by the reverse flow of current forcausing said coin suspension device to collect a coin. I

, 6. A telephone systemincluding a calling I telephone line, a paystation device at the associated with said automatic switch hav- I ingits opposite'poles connectedto the limbs of the calling line, meanscontrolled by the response of the called. subscriber for reversing saidconnections whereby the said magnet operates to collect a depositedcoin,

5, A telephone system including a calling- 1 mraasa and meanscontrolledby the replacement of the receiver at the calling substation prior tothe removal of the receiver at the called substation for refunding thesaid coin.

7.. A telephone system including a calling subscribers line, asubstation therefor provided with a coin. suspension device, a calledsubscribers line, an automatic switch for extending a connection in thedirection of the said called subscribers line, an operators callingdevice located at the exchange for controlling said automatic switch, abattery associated with said automatic switch having its opposite polesconnected to the limbs of the calling line, means controlled by theresponse of the called subscriber for reversing said connections, meanscontrolledby the reverse flow of current for causing said coinsuspension device to collect a vcoin, and means for refunding said coinif the calling. subscriber replaces his receiver before the calledsubscriber answers.

8. A telephone system including a calling telephone line, a pay. stationdevice at the substation of said line, a disposing magnet therefor,automatic switching apparatus associated with said calling line, anoperators calling device at the exchange for operating said automaticswitching apparatus for extending a connection to a called telephoneline, a source of current, and circuit connections including said magnetand said source of current efiective tooperate said magnet for adisposition of a deposited coin.

9. A telephone system including a calllng subscribers line, a substationtherefor provided with a coin suspension device, a called subscribersline, an automatic switch for extending a connection in the direction ofthe said called line, an operators calling device at the exchange forcontrolling the said automatic switch, a battery associated with saidautomatic switch having its opposite poles connected to the limbs of thecalling line, means controlled by the response of the called subscriberfor reversing the said connections, and means for causing saidsuspension device to refund or collect a coin, the said means beingcontrolled by the direction of the flow of current in the calling line.

10. A telephone system including a calling telephone line, a pay stationdevice at the substation of said telephone line, a polarized disposingmagnet therefor, mechanism controllable by said magnet for collecting orreturning a deposited coin, automatic switching apparatus associatedwith said telephone line, an operators calling device at the exchangefor controlling said switching apparatus to extend a connection to acalled subscribers line, a source of current, and circuit connectionsincluding said magnet and said source of current efiective to collect orreturn a deposited coin according as a response has or has not beensecured I telephone line,

operation the exchange from the called line.

' 11. A telephone system including a calling a pay station device at thesubstation of said telephone line, a polarized disposing magnettherefor, mechanism controlled by said magnet for collecting orrefunding a deposited coin, automatic switching apparatus associatedwith the callingline, an operators calling device at for controllingsaid switching extend a call to a called suba source of current, andcirapparatus to scribers hne',

cuit-connections lncluding said magnet and its opposite poles connectedto the limbs of the calling line, means controlled by the calledsubscriber for reversmg said connections whereby a suspended coin 1scollected,

- and means for refunding said coin when the.

calling subscriber replaces his receiver if the calledwsubscriber hasfailed tov respond.

' connection between said calling, and called thereto provided .switch13. A telephone system including a call-- line, a substation connecteding subscribers with a coin collecting dea called subscribers line, anautomatic adapted to connect said callin and called lines, an operatorscalling 5 located at the exchange for completing s'aid vice,

lines, a battery having its opposite poles connected to thelimbs of thecalling line, means under the control of the called subscriber forreversing such connections whereby a de osited coin is collected.

A telep one system including a calling subscribers line, a substationconnected thereto provided with a coin collecting device, a calledsubscribers line, an automatic switch adapted to connect said callin andcalled lines, an operators calling located at the exchange forcompleting said connection between said calling and called collecting aevice evice lines, a battery having its opposite poles connected to thelimbs of the calling line,

' means under the control of the called sub scriber for reversing such.connections whereby a deposited coin is collected, and means forrefunding said coin if the calling subscriber replaces his receiverbefore the called subscriber answers.

' 15, A telephone system includinga call-.

ing subscribers line, a substation therefor provided with a coincollecting device, a

called jsubscribers line, an automatic switch for extending a connectionin the direction y of the called subscribers line, an operators callingdevice at the exchange for controlling said automatic switch, meanscontrolled by the response of the called'subscriber for deposited coin,and means con-. trolled by the calling subscriber for returning saidcoin if the calling subscriber replaces his receiver before the calledsubscriber answers.

' 16., A telephone 'system including a calling subscribers line asubstation therefor provided with a coin collecting device, a calledsubscribers line, an automatic switch for extending a connection in thedirection calling device at the exchange for control ling said automaticswitch, means controlledby the response of the called subscriber forcollecting a.deposited coin, and means controlled by tlie callingsubscriber for returning saidcom.

17. A telephone system including a calling subscribers line, asubstation therefor provided with a coin; called subscribers line,'anautomatic switch for extending a connection inthe direction of the saidcalled line, an operators calling device at the exchange for controllingthe of the called subscribers line, an operators I suspension device, a

operation of said automatic switch, a battery associated with saidswitch and having 1 its opposite poles connected to the limbs of thecalling line, and means controlled by the called subscriber witnesses. ZI S GEORGE E. UEL E Witnesses: v I

B. ROCKFORD.

for'reversing said connec-v tions whereby a suspended coin is collected,

Signed by me at Chicago, county of Cook 1 and State of Illinois, in thepresence of two I I

